Reimplement the action based on godo and make it more orchestratable

This is a complete rewrite with the goal of being more orchestratable in a broader GitHub Actions context.

- Rewritten to use `godo` instead of shelling out to `doctl` for better error handling and overall control of the process. Fixes #112. Fixes #113.
- Supports picking up an in-repository (or filesystem really) `app.yaml` (defaults to `.do/app.yaml`, configurable via the `app_spec_location` input) to create the app from instead of having to rely on an already existing app that's then downloaded (though that is still supported). The in-filesystem app spec can also be templated with environment variables automatically (see examples below). Fixes #106.
- Prints the build and deploy logs into the Github Action log (configurable via `print_build_logs` and `print_deploy_logs`) and surfaces them as outputs `build_logs` and `deploy_logs`. Fixes #73.
- Provides the app's metadata as the output `app`. Fixes #92.

**Breaking changes:**

- The `images` input is no longer supported. Instead, use env-var-substitution for an in-repository app spec or the `IMAGE_DIGEST_$component-name`/`IMAGE_TAG_$component-name` environment variables to change the respective fields of images in an existing app.

.github/dependabot.yml

@@ -9,13 +9,6 @@ updates:
     directory: "/" # Location of package manifests
     schedule:
       interval: "daily"
-  - package-ecosystem: "docker"
-    directory: "/"
-    labels:
-      - "dependencies"
-    open-pull-requests-limit: 10
-    schedule:
-      interval: "daily"
   - package-ecosystem: "github-actions"
     directory: "/"
     labels:

.github/release-drafter.yml

@@ -47,9 +47,10 @@ autolabeler:
       - "**/*.md"
   - label: "enhancement"
     files:
-      - "internal/**/*"
+      - "**/*.go"
   - label: "maintenance"
     files:
       - ".github/**/*"
-      - "vendor/**/*"
-      - "testdata/**/*"
+      - ".ko.yaml"
+      - "go.mod"
+      - "go.sum"

.github/workflows/ci.yaml

@@ -0,0 +1,14 @@
+name: ci
+
+on:
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/setup-go@0a12ed9d6a96ab950c8f026ed9f722fe0da7ef32 # v5.0.2
+        with:
+          go-version: '1.22'
+      - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
+      - run: go test ./...

.github/workflows/image-publish.yaml

@@ -0,0 +1,20 @@
+name: image-publish
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - uses: actions/setup-go@0a12ed9d6a96ab950c8f026ed9f722fe0da7ef32 # v5.0.2
+        with:
+          go-version: '1.22'
+      - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
+      - uses: ko-build/setup-ko@3aebd0597dc1e9d1a26bcfdb7cbeb19c131d3037 # v0.7
+      - run: ko build -B ./deploy && ko build -B ./delete

.gitignore

@@ -1,4 +1,22 @@
-.DS_Store
-.vscode/
-main
-tmp.yml
+# If you prefer the allow list template instead of the deny list, see community template:
+# https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore
+#
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+# vendor/
+
+# Go workspace file
+go.work
+go.work.sum

.ko.yaml

@@ -0,0 +1,3 @@
+# This is necessary as the deploy action needs access to the filesystem and the default non-root
+# user makes that difficult.
+defaultBaseImage: alpine:latest

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) [year] [fullname]
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.